Ounces to Grams Calculator

Whether you are following a metric recipe, reading a nutrition label, checking a supplement serving size, or calculating a shipping weight, converting ounces to grams is a frequent everyday need. This calculator provides a precise result using the exact internationally defined conversion factor of 28.3495 grams per ounce, making it suitable for both casual cooking use and more precise applications like food labelling or laboratory measurements. Grams are the standard unit for food weight in most countries, while ounces remain common in US grocery packaging and recipe books. Having a reliable converter on hand saves time and prevents measurement errors that can affect recipe outcomes or dietary tracking accuracy. This is especially important for baking, where small weight discrepancies between cups and grams can significantly change the texture and structure of the final product. Professional bakers and home cooks alike benefit from using precise gram measurements rather than relying on volume-based cup measurements.

The calculator multiplies your ounce value by 28.3495, which is the internationally defined mass of one avoirdupois ounce in grams (the full precise value is 28.349523125 g). Multiplying the number of ounces by this factor gives the gram equivalent to four decimal places. The conversion is exact by definition — the gram and the avoirdupois ounce are both part of the unified international system of weights formalised in the 1959 international yard and pound agreement, so there is no approximation involved in the relationship between them. Note that this calculator uses avoirdupois ounces, the everyday unit used for food and general goods. Troy ounces — used for precious metals — are heavier at 31.1035 grams each and should not be used with this conversion.